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12. Britney Spears and Jason Alexander

Britney Spears had known Jason Alexander in high school, but they reconnected in Las Vegas in 2004. Then, somehow decided getting hitched was a good idea that Friday night. They partied at the Palms then got a ride to the Little White Wedding Chapel where they became husband and wife for all of 55 hours — until they sobered up came to their senses and got an annulment. Naturally.